Automatic control mechanism



April 24, 1928.

K. TESSKY AUTOMATIC CONTROL MECHANISM Filed Feb. 4. 192a Patented Apr. 24, 1928.

PATENT OFFICE.

KARL TESSKY, OI ESSLINGEfi-ON-T HE-NECKAB, GERIAJSI'Y.

AUTOMATIC CONTROL MECHANISM.

' Application filed February 4, 1926, Serial' No. 85,957, and in Germany February 21,

for operations which take a considerable time, and it may thus occur that it does not regulate properly the periods of the several -operations.

The control shaft is provided with a tappet b which clutches on the driving shaft are t rown in and out. When the control shaft rotates very slowly, its tappet'is unable to perform its operations roperly, and it is particularly unable to t row out the clutches on the driving shaft exactly in time, as the end of the tappet and the pawl with which it is in contact, do not separate immediately as would be the case with a more rapid rotation of the control shaft. v

It has been proposed to overcome this drawback. by connecting the pawl with a spring which throws it over as soon as it has been released. At the same time it is necessary to provide means for throwing out the pawl altogether when the tools are being set or certain. operations are not to be performed. To this end the pawl was ivotally arranged on a support which was ulcrumed on the clutch control lever so that by throwing over this support the pawl was placed beyond the reach of the tappet. With this construction, two pivots are provided, one for the support and'one for the pawl, and an exactly finished stop for securing the support in the inoperative position of the pawl. g

It has also been proposed to provide a movable sto for the 'awl which, when laced out 0 the way. 0? the pawl, permits y it to recede before said tappet. Both ex-.

pedients are unsatisfactory on account of their complication. It is an object of my invention to provide a simpler and more reliable device.

To this end I provide the pawl with two I contact faces for a spring actuated plunger,

' sleeve in.

these faces being so arran ed that the plunger automatlcally holds t e pawl in itsoperatlveand inoperative positions, asthe case maybe.

In the drawings affixed to this specification-and formingpart thereof a device em- .bodying my invention is illustrated by way of example. v

In the drawings Fig. 1 is a section at ri ht angles to the main and auxiliary contro shafts showing theoperating lever in elevation.

Fig. 2 is a section on the line 22 of Fig. 1. I

Fig. 3 is a part elevation showing a separate pivotal pawl.

Figs. 4 to 8 illustrate various positions of the 'pawl on the operating lever, drawn to a larger scale.

Fig. 9 is a section on the line VIII-VIII in Fig. 1, also drawn to a larger scale and Fig. 10 is a development of a slot in one of the clutch sleeves.

Referring first to Figs. 1, 2 of the drawings, '13 is the driving shaft and a is the control shaft, a is a disc secured on the-shaft a,

and b is a tappet which may be adjusted in .a groove (1? of the disc at. The tappet b has an inclined operating face for a pawl on a lever e. p

The lever is pivotally supported at ct, and f is a spring tending tohold it against a fixed stop 9. h is a pin at the op osite end of the lever z' which engages a s ot k in a clutch sleeve is which is adapted to be displaced on the driving shaft 71. As will appear from Fig. 9, the slot k is extended at w, a gradient 4 being interposed between the extension and the slot. While the pin it is in the narrow portion of the slot, the sleeve is is held against displacement on the shaft 5. A spring tends to hold the sleeve is engaged with teeth on a sleeve l which is keyed to the driving shaft 11;, and i is a driven part free to rotate on the shaft which is in permanent mesh with teeth on the opposits end of the sleeve Z: but does not interfere with the axial displacement of the m is a cam on the sleeve is which is adapted to cooperate with the end of the lever e so as to expel the pin h from the slot 10',

a is a pawl fulcrumed on the end of the lever e at g and adapted to cooperate with a plunger r which is guided in the boss e at the end of the lever z. A spring 1" tends to force the plunger 1 against the pawl c. 1' 8 is a plug closing the bore in the boss e in which the plunger spring 1" is concealed.

. The pawl a is provided with a wedge shaped face 11. adapted to cooperate with the tappet b. o and p are faces inclined at an I) obtuse angle to each other on the pawl and adapted 'to cooperate with the end of the plun r r. 's is a shoulder adjacent the face an adapted to engage the inner end of=the oss e l8 Fi 3-shows the pawl in its inoperative osition in which the plunger r engages its ace 0. The wedge n is in horizontal position and out of reach of the tappet b. When it is desired to operatethe clutch I on the driving shaft i, the pawl c is thrown over into the position of Fig. 4, the plunger 1* turning the pawl on its pin q until the face of the plunger is in full .contact with the face p of the pawl. ,When the wedge 'n, of U the pawl is engaged by the tap et b, as shown in Fig." 5, its wedge n ascends the inclined face of the tappet-which is rotated .clockwise with the disc a1'-and at the same time the pawl is turnedon its pin 9 until its shoulder s engages the inner face of the boss e. On further rotation of the shaft 0. the pawlc is raised, as shown in'Figs 5 and 6, and the lever e is turned about its fulcrum d against the action of the spring f.

The spring is prevented from moving the sleeve is into engagement with the sleeve l while the pin it of the lever e isin its groove and the clutch sleeves will only ecoine engaged when the in h is withdrawn from the groove. T is ma be ef-' ,fected mechanically by the tappet a cam m on'the .sleeve J0, or by hand with handle a at the end of the boss e I The operation of this device is asfollowsr When the pawl a is not engaged by the.-

tappet b, it assumes the inclined position illustrated in Fig. 4. When, on the clockw'ise rotation of the disc a the tappet 6 enturn the pawl 0 about its pin 9 until the L shoulder s engages the face .of the boss e as shown in Fig. 5. and will then rise on .the inclined face of the tappet and turn the lever e on its fulcrum d until the pin It at i the opposite end of the lever has been moved out of the groove 70', whereupon thesprin is will cause the sleeve is to become engage with the sleeve Z and will impart rotation to gages the end of the wedge 11., it will first this sleeve and to the parts connected there-- driving shaft, a control shaft, 0. tappet on.

out and the sleeve is is no longer-rotated by 70 the shaft '0'.

When the tappet 6 turns the lever e on its pivot 11, the pin it is moved out of the .slot is so that the spring k is free to connect the sleeve k with the sleeve 1 and to start the prescribed operation through the medium of the part 6'. However, the sleeve is is only permitted to perform one complete rotation at a time, the curve k being. so shaped as to throw out the clutch l, I: at the end of each rotation. -In order to revent interference on the part of the pm It, a tappet m is provided which moves the'pin h out of the groove k before the clutch is thrown in.

It will be understood that on the anticlockwise rotation .of the sleeve 70 the extended end 00' of the slot k will first be entered by the in h, and, on further rotation of the sleeve it will be pushed asideby the pin h-engaging the adient and the sleeve will be disconnects from t e-teeth of the. part I be arrested by the pin when the rear end of the narrow slot portion abuts againstthe pin 12., and remains stationary until the pin it is again moved out of the slot k by the cam b lifting the end of the lever e. I

The operation to be performed "generally .does not require a complete revolution of the sleeve k, notwithstanding provision is made that it should erform a complete revolution as it is-desirable that it'should return to its initial Position. The cam m. lags for an angle 0 about 180 deg. with respect to the rear end of the slot Ia, so

that, when the slot has moved throughthat angle, the cam on will strike the pinit and lift the awl a quite clear of the ta t b. I wis it to be understood that do not desire to be limited to the. exact details of construction shown and described, for'obvious modifications will ocur to a person skilled in the art.

I claim: 1; An automati'c control mechanism comgrising a driving shaftya clutch on said riving shaft, 3, control shaft, a tgppet on said control shaft, means adapt to be actuated by said tappet to operatesaid clutch, an adjustable pawl pivotally carried on said clutch-operating means, a projection on said pawl adapted to cooperate with said tap t,- two contact faces on said pawl exten ing at an'ansgte to each other, and a s ing plunger 'dably carried 0 d 125 c 11 em utch-operating means and adapted to alternately engage said contact faces. 2. .An automatic control mechanism comprising a driving shaft, a clutch on said 0 sale controi shaft, means adapted to be actpawl, a boss on said clutch-operating means uated by said tappet to operate said clutch, adapted to be engaged by said shoulder, and an adjustable pawl pivotally carried on said a spring plunger slidably carried on said N clutch-operating means, a projection on said clutch-operating means and adapted to ai- 5 pawl adapted to cooperate with said tappet, ternately engage said contact faces,

two contact faces on said pawl extending a In testimony whereof I-afix 1138' si natui'e. at an angle to each other, a shoulder on said KARL ES 

